Mathematical modeling is to describe the actual physical world with mathematical tools, such as various forms of equations.

For example, the simplest uniform linear motion, using S = vt to describe the relationship between displacement and speed and time, is the mathematical modeling of this physical motion.

Of course, there are more complex physical environments, so we need to use more advanced mathematical tools, such as multi-order differential equations, or use the method of state variables to analyze the physical world, but in short, we all use mathematical language to describe the physical world.